Sawmill Lumber Tracking via Laser Scanning Auditing
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Solution Overview
Problem
Modern sawmills lack an effective feedback system to determine if processing stations are realizing optimal value from lumber, with no global feedback on which pieces of lumber were obtained from each processed log, leading to difficulties in troubleshooting errors and optimizing processes.
Innovation Solution
Implementing a sawmill auditing system with independent scan zones using point or planar laser scanners to scan lumber, coupled with an auditing computer that analyzes geometric characteristics and compares them to expected values, providing feedback on individual station performance and associating lumber with its originating log or cant, thus establishing a global feedback loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated processing stations are used to maximize productivity, then lumber production efficiency is improved, but the ability to track and audit individual lumber pieces through the process is lost
Solution Approach 1:
The patent uses laser scanners to create optical copies (scans) of lumber pieces at multiple stations throughout the automated processing line. These digital copies contain geometric characteristics that can be tracked and associated with the physical lumber pieces, enabling information retention without manual intervention in the automated flow.
Solution Approach 2:
The patent introduces an intermediary auditing system with laser scanners and computer vision technology that bridges the gap between automated processing stations. This intermediary system captures and processes information about lumber pieces without interfering with the automated production flow, allowing tracking while maintaining productivity.
2Device complexity
If multiple processing stations operate independently to maintain system simplicity, then device complexity is reduced, but global feedback on lumber optimization is lost
Solution Approach 1:
The patent merges the auditing functions of multiple processing stations into a single integrated system. The computer vision system and laser scanners at different stations capture data that is combined and processed together, allowing global feedback on lumber optimization while maintaining relatively simple individual station designs.
Solution Approach 2:
The auditing system performs multiple functions: it scans lumber geometry, tracks pieces through processing, audits optimization performance, and provides feedback to multiple stations. This multi-functional approach reduces overall system complexity by using a single versatile system rather than separate specialized systems at each station.
3Measurement precision
If laser scanners are added to create scan zones for tracking lumber, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with optical laser scanners and computer vision technology. This substitution provides precise measurement of lumber geometric characteristics while reducing mechanical complexity, as the optical systems can capture multiple dimensions simultaneously without complex mechanical moving parts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides immediate feedback for corrective actions, updates optimization algorithms, and ensures the sawmill realizes optimal value from each processed log by identifying and addressing mechanical, scanning, and optimization system issues.
Implementation Method 1
The scan zones include point or planar laser scanners to scan passing pieces of lumber
Implementation Method 2
laser scanners to scan passing pieces of lumber
Data Source
AI summary
At least one geometric characteristic for each of a number of pieces of lumber is determined. Each of the pieces of lumber may then be logically associated with at least one of a log or a cant from which the piece of lumber was sawn.